CVE-2026-21589 KEV
Patch first
On CISA KEV — known exploited in the wild, due 2026-10-18.
Description
This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access vulnerability allows an unauthenticated attacker to access specific files within the web application root directory in affected versions. Exploitation requires prior knowledge of the target file's exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents. In some configurations, there may be some sensitive files that make this highly severe. This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. The vulnerability must be addressed for affected versions of: -- Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 -- Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19 -- Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.7, 7.2.4 -- Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12 -- Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12 -- Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 -- Crucible, fix versions 4.9.15 -- Fisheye, fix version 4.9.15 -- Exploitation requires prior knowledge of the target file's exact name and path. The vulnerability does not include the capability to enumerate or list directory contents.
Scoring
| CVSS | 7.5 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| EPSS | 2.78% — more likely to be exploited than 86% of all CVEs |
| Weakness | CWE-552 |
| On CISA KEV | yes — remediate by 2026-10-18 |
| Public exploit | none known |
| Published | 2026-10-05 |
| Last modified | 2026-10-15 |
CISA KEV
| Name | Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability |
|---|---|
| Added | 2026-10-15 |
| Due | 2026-10-18 |
| Vendor / product | Atlassian / Multiple Products |
| Ransomware use | none reported |
Affected (9)
| Vendor | Product |
|---|---|
| atlassian | bamboo |
| atlassian | bitbucket data center |
| atlassian | bitbucket server |
| atlassian | confluence data center |
| atlassian | crowd |
| atlassian | crucible |
| atlassian | fisheye |
| atlassian | jira data center |
| atlassian | jira service management |
References
- https://jira.atlassian.com/browse/BAM-26567
- https://jira.atlassian.com/browse/BSERV-20604
- https://jira.atlassian.com/browse/CONFSERVER-104488
- https://jira.atlassian.com/browse/CRUC-8741
- https://jira.atlassian.com/browse/CWD-6610
- https://jira.atlassian.com/browse/FE-7583
- https://jira.atlassian.com/browse/JRASERVER-79546
- https://jira.atlassian.com/browse/JSDSERVER-16809
- https://github.com/watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21589
→ the Explorer · watch your stack · NVD